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20 January 2000 • AGE-NC Project No 95-0173 Page 14 of 14 45 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGING SYSTEM MAINTENANCE The SVE/IAS system will be maintained on a weekly basis, according to manufacturers recommendations After stabilization, routine maintenance would represent the only periods of "down time"for the unit One to two times each month(assuming 24-hour operation), the unit will be shut down for routine maintenance procedures such as lubrication, oil changing, and system adjustments 46 PROGRESS/CONFIRMATION SOIL SAMPLING L After approximately six months of operation or efficiency of the unit has declined, soil samples will be collected from the "core"petroleum hydrocarbon Impacted area at the'site Analytical results of the soil samples will serve to approximate remaining petroleum hydrocarbon levels and determine if continuing remedial operation Is necessary Samples will be collected utilizing a direct push technology AGE proposes to advance soil probe . borings In the "core" petroleum hydrocarbon Impacted area at the site to depths of approximately 50 feet bsg Probe boring will be advanced using a Geoprobe 5400 soil probing unit Discrete soil samples will be collected at five-foot Intervals beginning at a depth of 10 feet bsg utilizing a Geoprobe soil sampling assembly loaded with pre-cleaned 1 125-inch by 6-Inch brass sleeves Soil samples will be preserved by covering both ends of the second brass sleeve with Teflon sheets,plastic end caps and sealed with tape Each sample sleeve will be labeled with the following information soil probe boring location, depth, time, date and sampler's Initials Soil samples will be transported In a cooler under ice to a DHS-certified laboratory for analysis of TPH-g, TPH-d, BTE&X,MTBE,DIPE,TAME,ETBE and TBA in accordance with EPA methods 8015m, 8020 and 8260 Advanced GeoEnWronmental,Inc